Tests for Anions

How do you test for carbonates?

* Add a few drops of dilute HCL
* Connect to limewater via delivery tube
* If limewater turns cloudy test is positive

Why does limewater turn cloudy if a carbonate is present?

A white precipitate is formed

How do you test for sulfates?

* Add a few drops of dilute HCL and barium chloride
* If a white precipitate if formed test is positive

Why is dilute HCL added when testing for sulfates?

To remove any carbonates

How do you test for halides?

Add a few drops of nitric acid and silver nitrate

What is the colour of a chloride precipitate?

White

What is the colour of a bromide precipitate?

Cream

What is the colour of an iodide precipitate?

Yellow

How do you test for hydrogen?

Squeaky poppy test

How do you test for oxygen?

Relighting a glowing splint

How do you test for carbon dioxide?

Limewater test

How do you test for chlorine?

Using damp litmus paper